When I enter a shop with a closed door I always glance around after pushing the door open to see whether there is anyone behind me. If I see someone approaching I wait, holding the (usually heavy) door open, expecting that they will take it from me. I do the same thing in reverse when leaving a shop. If the person behind is old and frail, or in a wheelchair, or if they have a pushchair, then I will happily keep holding the door open while they pass through. Otherwise I expect whoever is behind to relieve me of said door, maybe with a thank you or a smile.
AIBU to want to slap the faces of the obviously able bodied people who swan past me without a word or even a glance when I'm holding the door open, leaving me stranded and looking like an idiot?